LT3507A
4
3507afa
For more information www.linear.com/LT3507A
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted (Notes 2, 7)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch 1 Current Limit (Note 3) Duty Cycle = 15%
l
4.3 5.1 6 A
Switch 1 V
CESAT
I
SW1
= 2A (Note 6) 400 600 mV
BOOST1 Operating Current I
SW1
= 2A 40 60 mA
Converter 2
V
C2
to Switch Current Gain 4.3 A/V
Switch 2 Current Limit (Note 3) Duty Cycle = 15%
l
2.7 3.3 4 A
Switch 2 V
CESAT
I
SW2
= 1.5A (Note 6) 350 500 mV
BOOST2 Operating Current I
SW2
= 1.5A 40 60 mA
Converter 3
V
C3
to Switch Current Gain 4.3 A/V
Switch 3 Current Limit (Note 3) Duty Cycle = 15%
l
2.7 3.3 4 A
Switch 3 V
CESAT
I
SW3
= 1.5A (Note 6) 350 500 mV
BOOST3 Operating Current I
SW3
= 1.5A 40 60 mA
LDO Regulator
Feedback Pin Voltage
l
788 800 812 mV
Feedback Pin Bias Current –150 –500 nA
Error Amplifier Voltage Gain 1100 V/V
Line Regulation V
IN
from 5V to 36V 0.05 %/V
Load Regulation I
DRIVE
from 0.1mA to 10mA 0.005 %/mA
DRIVE Output Current Limit
l
10 15 22.5 mA
Dropout Voltage, V
IN1
to DRIVE I
DRIVE
= 10mA, V
IN
= 5V 1.7 2.0 V
Dropout Voltage, BIAS to DRIVE I
DRIVE
= 10mA, V
IN
= 5V 0.5 0.8 V
Over/Undervoltage Lockout
Undervoltage Lockout Threshold 1.15 1.20 1.25 V
Overvoltage Lockout Threhold 1.15 1.20 1.25 V
Undervoltage Lockout Hysteresis Current V(UVLO) < 1.2V 7 10 13 µA
Overvoltage Lockout Hysteresis Current V(OVLO) > 1.2V –7 –10 –13 µA
Input Bias Current (OVLO and UVLO) V(OVLO) = 1.0V, V(UVLO) = 1.5V –100 –200 nA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3507AE is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3507AI is guaranteed to meet performance specifications from –40°C
to 125°C junction temperature. The LT3507AH is guaranteed over the
full –40°C to 150°C operating junction temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 3: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Junction temperature will exceed the maximum operating range when
overtemperature protection is active. Continuous operation above the
specified maximum operating junction temperature may impair device
reliability.
Note 6: Switch V
CESAT
for the FE package is guaranteed by design and/or
correlation to static test.
Note 7: Positive currents flow into pins, negative currents flow out of pins.
Minimum and maximum specifications refer to absolute values.
